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Summary

In 20 normal pregnant women the excretion of oestrogen and creatinine during four fractions of a 24-hour period was determined. For each urine specimen the total oestrogen content, the oestrogen concentration, the total creatinine content and the oestrogen-creatinine ratio were studied.

A peak of oestrogen excretion was found in the first fraction. The oestrogen-creatinine ratio of the second fraction was most closely correlated to the 24-hour oestrogen-creatinine ratio.